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  <a name="EN-US_TOPIC_0000002017987564"></a><a name="EN-US_TOPIC_0000002017987564"></a>
  <h1 class="topictitle1">Some of the Concurrent Jobs on the Same NDMP Server Failed</h1>
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   <div class="section">
    <h4 class="sectiontitle">Symptom</h4>
    <p>When multiple file system backup jobs are concurrently executed on the same NDMP server, some of these jobs fail to be executed.</p>
    <div class="fignone">
     <span class="figcap"><b>Figure 1 </b>Backup jobs</span><br><span><img src="en-us_image_0000002018901578.png"></span>
    </div>
    <p></p>
    <div class="fignone">
     <span class="figcap"><b>Figure 2 </b>Failed jobs</span><br><span><img src="en-us_image_0000002018901854.png"></span>
    </div>
    <p></p>
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   <div class="section">
    <h4 class="sectiontitle">Possible Causes</h4>
    <p>The maximum number of concurrent backup jobs supported by the NDMP service varies depending on the storage vendor and the flow control of the storage vendor may be triggered.</p>
   </div>
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    <h4 class="sectiontitle">Troubleshooting</h4>
    <ol>
     <li><span>Adjust the number of concurrent backup jobs based on the flow control threshold of each storage vendor. OceanStor Dorado is used as an example. You can obtain the flow control threshold of a specific model from <a href="https://storageinfo.rnd.huawei.com/spec/#/home" target="_blank" rel="noopener noreferrer">Specifications Query</a>.</span></li>
     <li><span>Choose <strong>Protection</strong> &gt; <strong>File Systems</strong> &gt; <strong>Storage Devices</strong>.</span></li>
     <li><span>In the row of the target device, choose <strong>More</strong> &gt; <strong>Modify</strong>.</span></li>
     <li><span>Change <span class="uicontrol"><b>Number of Concurrent Tasks</b></span> to a value that is less than or equal to the flow control threshold provided by the corresponding vendor.</span></li>
     <li><span>Click <span class="uicontrol"><b>OK</b></span>.</span></li>
    </ol>
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     <strong>Parent topic:</strong> <a href="nas_s_0097_0.html">FAQs</a>
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